module.exports = function () {
    var arg1 = 10;
    var arg2 = 20;
    var car = function car(num) {
        this.num = num;
        this.add = function () {
            this.num++;
            console.log(this.num);
        }
    }
    var car1 = new car(1);
    var car2 = new car(10);
    car1.add();
    car2.add();



}